A client with type 1 (insulin-dependent) diabetes mellitus has just learned she's pregnant. The nurse is teaching her about insulin requirements during pregnancy. Which guideline should the nurse provide
A．"Insulin requirements don't change during pregnancy. Continue your current regimen. "
B．"Insulin requirements usually decrease during the last two trimesters. "
C．"Insulin requirements usually decrease during the first trimester. "
D．"Insulin requirements increase greatly during labor. "
参考答案：C
解析：Maternal insulin requirements usually decrease during the first trimester due to rapid fetal growth and maternal metabolic changes, necessitating adjustment of the insulin dosage. Maternal insulin requirements fluctuate throughout pregnancy; after decreasing during the first trimester, they rise again during the second and third trimesters when fetal growth slows. During labor, insulin requirements diminish due to extreme maternal energy expenditure.